Beyond what 'scrollaway wrote, I'd add that even granting some degree of danger inherent to an idea, it's only because dangerous is synonymous with powerful, which - in case of science and technology - is usually synonymous with useful.
So the idea of atoms splitting leads to atomic bombs, which - when used on people - are evil, but it also leads to nuclear power plants (and by extension, to fixing current energy problems in an environmentally-friendly way), it leads to new scanning methods in medicine, it leads to improvements in agriculture, etc., and it leads to many similarly powerful spin-off ideas. Hell, it could open up the Solar System for us if people weren't scared shitless of it. Sure we got MAD, and we pointed a lot of nukes at each other, but we survived, and so far we're much better off with the idea of splitting atoms than without it.
And genetic engineering, while opening us up for new kinds of dangers, also has so much more potential than nuclear physics. It has the theoretical capacity of solving most of the problems of humanity, from food supply and environmental damage, to sickness, decay and death. I'd say that the biggest moral hazard here is not pursuing it.
And ultimately, let's not forget that scientific ideas are either good or bad models of the world, and whatever practical danger that comes of it is because of people who go apeshit and exploit achievements of science and technology to further their insanity. So maybe let's focus on restricting the impact of dangerous groups of people. As for the ideas themselves, to quote Eugene T. Gendlin:
What is true is already so.
Owning up to it doesn't make it worse.
Not being open about it doesn't make it go away.
And because it's true, it is what is there to be interacted with.
Anything untrue isn't there to be lived.
People can stand what is true,
for they are already enduring it.